Until you start Zabbix Server with docker-compose and get information from other hosts

background

As a designer, I don't often build a production network environment in my work, and I often create a demo environment to check ideas, so I haven't done much server monitoring until now.

However, when I started using k8s and GitLab CE, the server configuration became complicated, and when a problem occurred, the server became too heavy and I could not log in to the server with ssh etc. in the first place. I had a problem, so I decided to install a monitoring tool.

Zabbix + docker-compose

Due to the above background, I was not very familiar with monitoring tools, but my senior at the company taught me the tools Zabbix and MUNIN. It seemed easier to use MUNIN, but I thought that Zabbix would be better when it comes to monitoring clusters of k8s, so I decided to use Zabbix this time.

Fortunately, the configuration of docker-compose was officially uploaded, so I built it based on it, but it was very easy to build. This is also thanks to the wisdom of our predecessors!

environment

Basically all servers are composed of ʻubuntu 20.04`. There is no problem with any number of clients to be monitored.

--Zabbix server x 1 --Monitored client x n

Install Docker and docker-compose

Basically, we will proceed according to the official website.

Docker

https://docs.docker.com/engine/install/ubuntu/

sudo apt-get update
sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    software-properties-common

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

sudo add-apt-repository \
   "deb [arch=amd64] https://download.docker.com/linux/ubuntu \
   $(lsb_release -cs) \
   stable"

sudo apt-get update
sudo apt-get install docker-ce docker-ce-cli containerd.io

docker-compose

https://docs.docker.com/compose/install/

sudo curl -L "https://github.com/docker/compose/releases/download/1.27.4/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose
sudo chmod +x /usr/local/bin/docker-compose

Give execute permission

If it is left as it is, root authority is required to execute it, so make it possible for the current user to execute it.

sudo groupadd docker
sudo usermod -aG docker $(id -u -n)

After this, ** log in again for the settings to take effect. ** **

Zabbix Server

First, start the server. It was easy to start using docker-compose.

clone

The official docker-compose set is clone.

git clone https://github.com/zabbix/zabbix-docker.git
cd zabbix-docker

Configuration selection

Copy any configuration file as docker-compose.yaml. I used docker-compose_v3_alpine_pgsql_latest.yaml here.

cp docker-compose_v3_alpine_pgsql_latest.yaml docker-compose.yaml

Time zone

By default, the time zone is not Japan, so change it.

nano .env_web

…
PHP_TZ=Asia/Tokyo
…

iptables

Open the ports required for communication.

sudo iptables -A INPUT -s 192.168.1.0/24 -p tcp --dport 10051 -j ACCEPT

Start-up

Now that the settings are complete, start up.

docker-compose up -d

Initial setting

Go to Settings> Host> Zabbix server. By default, the interface part contains 127.0.0.1, but remove it and enter zabbix-agent in place of the DNS name. Also, set the connection method to DNS.

I forgot to take a capture and took it later, so the number of hosts is already 2, but this completes the basic server settings!

Zabbix Agent

Next, set the client to be monitored and display it on the server.

Agent installation

It is provided by ʻapt`, so install it obediently.

sudo apt-get install zabbix-agent

Agent settings

Set up the agent.

sudo nano /etc/zabbix/zabbix_agentd.conf

There are various setting items, but the essential one is

Server=<IP address of Zabbix Server>
ServerActive=<IP address of Zabbix Server>
Hostname=<Arbitrary host name>

was. ** The host name set here is arbitrary, but you will need it later when setting it on the server side. ** **

Service restart

Reboot for the settings to take effect.

sudo service zabbix-agent restart

iptables

Also open the communication port here.

sudo iptables -A INPUT -s 192.168.1.0/24 -p tcp --dport 10050 -j ACCEPT

Bonus: Zabbix agent settings can be scripted

Manual setting on multiple terminals is a pain, so I ran it with the following command.

SERVER_IP=<Server IP>
HOSTNAME=<hostname>

sudo sed -i -e "s/127.0.0.1/$SERVER_IP/g" -e "s/Hostname=Zabbix server/Hostname=$HOSTNAME/g" /etc/zabbix/zabbix_agentd.conf

sudo service zabbix-agent restart
sudo iptables -A INPUT -s 192.168.1.0/24 -p tcp --dport 10050 -j ACCEPT

Register with Zabbix Server

hostname --Group
interface

Is a required item. Use the host name you set earlier.

Go to the Templates tab and select any one. This time we will use Template OS Linux by Zabbix agent.

After setting up to this point, press "Add" to complete the setting!

Finally

The introduction of the monitoring tool seemed difficult, but it was surprisingly easy to introduce. It's great that you could start Zabbix Server with docker-compose. This time, I just introduced it and I can't follow the detailed usage, but it is a popular tool with many introductory articles, so I will study it from now on.

reference

This article was created with full reference to the following articles.

[Procedure to start Zabbix 5.0 with Docker Compose](https://qiita.com/zembutsu/items/d98099bf68399c56c236#docker-%E3%81%A8-docker-compose-%E3%82%92%E3%82% BB% E3% 83% 83% E3% 83% 88% E3% 82% A2% E3% 83% 83% E3% 83% 97) [Install and monitor Zabbix-agent on your Ubuntu](https://chee-s.net/%E6%99%AE%E6%AE%B5%E4%BD%BF%E3%81% 84% E3% 81% AEubuntu% E3% 81% ABzabbix-agent% E3% 82% 92% E3% 82% A4% E3% 83% B3% E3% 82% B9% E3% 83% 88% E3% 83% BC% E3% 83% AB% E3% 81% 97% E3% 81% A6% E7% 9B% A3% E8% A6% 96% E3% 81% 99% E3% 82% 8B)